US20250309555A1 - Reflection panel and electromagnetic-wave reflecting apparatus - Google Patents

Reflection panel and electromagnetic-wave reflecting apparatus

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Publication number
US20250309555A1
US20250309555A1 US19/238,110 US202519238110A US2025309555A1 US 20250309555 A1 US20250309555 A1 US 20250309555A1 US 202519238110 A US202519238110 A US 202519238110A US 2025309555 A1 US2025309555 A1 US 2025309555A1
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United States
Prior art keywords
panel
reflection
electromagnetic
wave
interval
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
US19/238,110
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English (en)
Inventor
Kumiko Kambara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
Original Assignee
Asahi Glass Co Ltd
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Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Assigned to AGC Inc. reassignment AGC Inc. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAMBARA, KUMIKO
Publication of US20250309555A1 publication Critical patent/US20250309555A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/148—Reflecting surfaces; Equivalent structures with means for varying the reflecting properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/18—Reflecting surfaces; Equivalent structures comprising plurality of mutually inclined plane surfaces, e.g. corner reflector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/185—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces wherein the surfaces are plane

Definitions

  • 5G fifth-generation
  • 5G fifth-generation
  • Means for sending radio waves to target terminal apparatuses or radio devices are required in a place where a plurality of metal machines are present, such as a factory, or in a place where a large number of reflections occur from wall surfaces or roadside trees, such as an area with a plurality of buildings.
  • NLOS Non-Line-Of-Sight
  • the meta-surface is formed of periodic structures or patterns that are finer than the wavelength and designed so as to reflect radio waves in a desired direction (see, e.g., Diaz-Rubio et al., Sci. Adv. 2017:3: e1602714 1). Since a meta-surface makes it possible to obtain a desired reflection angle while maintaining a planar arrangement/configuration, it can effectively function as a reflector even in an environment in which there is not enough space to install a large number of electromagnetic-wave reflection panels.
  • a reflector of a meta-surface requires processing of precise metal and resin layers smaller than a wavelength of a 5G radio wave.
  • the typical size of the reflector is about 150 mm to 500 mm on a side.
  • the reflector of the meta-surface alone may not be sufficient to improve a reflection efficiency and a propagation environment.
  • a reflector using specular reflection there are many options of materials for a conductive layer which is a functional layer, and a limitation on the size thereof is small.
  • specular reflection a large-sized panel can be easily fabricated, good reflection characteristics can be obtained, and a sufficient propagation environment improvement effect can be produced.
  • the reflector can reflect only in a direction of regular reflection in relation to the position of a base station, and the reflection angle thereof cannot be controlled. Thus, a place where the reflector is installed is likely to be limited.
  • One of the objects of the present invention is to provide a reflection panel and an electromagnetic-wave reflecting apparatus having the advantages of both a meta-surface and specular reflection.
  • a reflection panel and an electromagnetic-wave reflecting apparatus having the advantages of both a meta-surface and specular reflection are provided.
  • FIG. 1 is a schematic diagram of an electromagnetic-wave reflecting apparatus using a reflection panel according to an embodiment
  • FIG. 2 is a side view of the reflection panel
  • FIG. 3 is a schematic diagram of an electromagnetic-wave reflecting fence in which a plurality of electromagnetic-wave reflecting apparatuses are connected to one another;
  • FIG. 4 A is a perspective view showing an example of a holding part that holds a second panel
  • FIG. 4 B is a schematic side view of FIG. 4 A ;
  • FIG. 5 is a diagram showing another example of the holding part that holds the second panel
  • FIG. 6 is a diagram showing an example of a configuration of a frame used to hold the second panel in FIG. 5 ;
  • FIG. 7 is a diagram showing a state in which the frame holds adjacent reflection panels
  • FIG. 8 is a diagram showing another example of the holding part that holds the second panel
  • FIG. 9 is a schematic diagram of a layer structure of a first panel
  • FIG. 10 is a schematic plan view of a meta-surface of the second panel
  • FIG. 11 is a diagram showing an example of a unit pattern constituting the meta-surface
  • FIG. 12 is a schematic diagram of a layer structure of the second panel.
  • FIG. 13 is a diagram showing an analysis space of the second panel.
  • a reflection panel having the advantages of both a meta-surface and specular reflection is provided by combining a first panel using the specular reflection and a second panel of the meta-surface.
  • the first panel using the specular reflection does not require fine patterning, and a panel having a large area is easily fabricated.
  • the second panel having the meta-surface is disposed on one surface of the first panel.
  • the second panel is disposed at a predetermined interval from the surface of the first panel, specifically, at an interval of 0.0 mm or longer and less than 100.0 mm, on a side of the first panel on which an electromagnetic wave is incident.
  • the second panel is positioned on the front surface of the first panel as viewed from an electromagnetic wave incident on the first panel.
  • the second panel be movably or detachably held on an incident surface side of the first panel, and the second panel can be attached in accordance with the place where the reflection panel is installed, so that the position of the second panel can be adjusted on the first panel.
  • a plane size of the second panel is smaller than that of the first panel, and a plurality of the second panels may be arranged on the incident surface side of the first panel.
  • legs 56 may be provided. Although the legs 56 support the lower end of the frames 50 in the example shown in FIG. 1 , the legs 56 may be connected to the bottom frame 58 . The legs 56 may be fixed to the floor or road surface with screws or the like. The legs 56 may be equipped with movable components such as casters so that they can be moved in the place where the electromagnetic-wave reflecting apparatus 60 is installed. The legs 56 may not be provided, and the entire periphery of the reflection panel 30 may be surrounded by frames, and the electromagnetic-wave reflecting apparatus 60 may be installed obliquely to the wall, ceiling, floor, or the like.
  • second panels 20 - 1 and 20 - 2 are respectively attached to first panels 10 - 1 and 10 - 2 .
  • the second panels 20 - 1 and 20 - 2 may be respectively attached onto the first panels 10 - 1 and 10 - 2 at the same position or different positions in accordance with an arrival direction of an electromagnetic wave and a direction in which the electromagnetic wave is to be reflected.
  • the plane (vertical and horizontal) size and the reflection characteristic of the second panel 20 - 1 and the plane size and the reflection characteristic of the second panel 20 - 2 may be the same as or different from each other.
  • the plane size indicates the vertical and horizontal size.
  • the plane size of the first panel 10 indicates the vertical and horizontal size of the panel.
  • the second part 312 extends from a tip of the first part 311 opposite to the hook thereof to support the second panel 20 .
  • a tip of the second part 312 is fitted into a hole or slit 21 (hereinafter simply referred to as a “hole 21 ”) provided in the second panel 20 to support the second panel 20 .
  • a part where the second part 312 is fitted into the hole 21 may be reinforced with an adhesive.
  • the second part 312 is slidable in the second direction (the Z direction in this example) relative to the first part 311 , so that the length of the holding part 31 A can be changed in the Z direction. Locks or latches may be provided at predetermined intervals in the second part 312 .
  • first part 311 and the second part 312 are shown as single-stage sliders, but may be two-stage or more-stage sliders.
  • the second part 312 may have a hollow shell structure, and a rod of a third part may be slid inside the second part 312 .
  • the holding part 31 A is hooked on the top frame 57 A.
  • a rail for slidably holding the first part 311 may be provided in the bottom frame 58 (see FIG. 1 ).
  • the second part 312 extends in the height (+Z) direction to support the second panel 20 from below.
  • the holding part 31 A may be slidably formed on the frame 50 for holding a side edge of the reflection panel 30 A.
  • the first part 311 slides in the longitudinal direction of the reflection panel 30 A, and the second part 312 extends and contracts in the lateral direction of the reflection panel 30 A.
  • the second panel 20 is movably held relative to the first panel 10 .
  • FIG. 5 shows a holding part 31 B for holding the second panel 20 .
  • the holding part 31 B includes a first part 313 which is movable in the first direction of the first panel 10 and a second part 312 which supports the second panel 20 and the length of which can be changed in the second direction of the first panel 10 .
  • the first part 313 has such a hook-like shape that it can be slidably hooked on a slit 522 of a top frame 57 B that covers the upper end of the first panel 10 .
  • the second part 312 extends from a tip of the first part 313 opposite to the hook thereof to support the second panel 20 .
  • the tip of the second part 312 is fitted into the hole 21 provided in the second panel 20 to support the second panel 20 .
  • a part where the second part 312 is fitted into the hole 21 may be reinforced with an adhesive.
  • the second part 312 is slidable in the height direction (the Z direction) relative to the first part 313 , so that the length of the holding part 31 B can be changed in the Z direction. Locks or latches may be provided at predetermined intervals in the second part 312 .
  • the entire holding part 31 B is transparent to electromagnetic waves reflected by the first panel 10 and the second panel 20 .
  • Each of the first part 313 and the second part 312 of the holding part 31 B preferably has roughly the same dielectric constant and dielectric loss tangent as those of the dielectric layers used in the first panel 10 and the second panel 20 , and minimizes an influence on the reflection characteristics of the first panel 10 and the second panel 20 .
  • an adhesive is applied to the part where the second part 312 is fitted into the hole 21 , it is also desirable that the adhesive have roughly the same dielectric constant and dielectric loss tangent as those of the dielectric layers of the first panel 10 and the second panel 20 .
  • the bottom frame 58 may include a rail for sliding the first part 313 , or the holding part 31 B may be slidably formed on the frame 50 for holding a side edge of a reflection panel 30 B.
  • FIG. 6 shows an example of a configuration of the top frame 57 B.
  • FIG. 6 is a cross-sectional view along a YZ plane of FIG. 5 .
  • the top frame 57 B includes a main body 520 , a slit 521 and the slit 522 formed on respective sides of the main body 520 in the long axis direction thereof, cavities 523 and 524 respectively communicating with the slits 521 and 522 , and grooves 525 and 526 respectively provided in the cavities 523 and 524 .
  • the upper end of the first panel 10 is inserted into the slit 521 and fixed by fitting it into the groove 525 .
  • the slit 522 on the opposite side is used as a rail for sliding the first part 313 of the holding part 31 B.
  • the top frame 57 B may have the same shape as that of the frame 50 for holding the adjacent reflection panels 30 .
  • FIG. 7 shows a state in which the adjacent first panels 10 - 1 and 10 - 2 are held by the frame 50 having the same shape as that of the top frame 57 B.
  • the first panels 10 - 1 and 10 - 2 are respectively inserted into the grooves 525 and 526 (see FIG. 6 ) and are stably held.
  • at least a part of the frame 50 in particular, the central part of the main body 520 extending between the grooves 525 and 526 , is formed of a good conductor.
  • the top frame 57 B that receives the holding part 31 B may be entirely formed of a non-conductor such as resin.
  • the second panel 20 By attaching the holding part 31 B using the top frame 57 B, the second panel 20 can be held so that the position thereof relative to the first panel 10 can be adjusted.
  • the first panel 10 and the second panel 20 can be separately conveyed when they are conveyed to an installation place, and the second panel 20 can be incorporated at a desired position in the first panel 10 at the installation place.
  • FIG. 8 shows a holding part 31 C for holding the second panel 20 .
  • the holding part 31 C includes a first part 315 which is movable in the first direction of the first panel 10 , the second part 312 extending from a tip of the first part 315 and the length of which can be changed in the second direction of the first panel 10 , and a socket 34 for holding the second panel 20 at the tip of the second part 312 .
  • the first part 315 is movably attached to an edge of the first panel 10 at a desired position thereon.
  • the first part 315 has such a hook-like shape that it can be slidably hooked on the slit 522 of the top frame 57 B that covers the upper end of the first panel 10 .
  • the second part 312 extends from the tip of the first part 315 opposite to the hook thereof, and the length of the second part 312 in the long axis direction can be changed.
  • the tip of the second part 312 and an upper end of the second panel 20 are supported by the socket 34 .
  • the second part 312 is slidable in the height direction (the Z direction) relative to the first part 315 , so that the length of the holding part 31 B can be changed in the Z direction. Locks or latches may be provided at predetermined intervals in the second part 312 .
  • the entire holding part 31 C is transparent to electromagnetic waves reflected by the first panel 10 and the second panel 20 .
  • Each of the first part 315 , the second part 312 , and the socket 34 of the holding part 31 C preferably has roughly the same dielectric constant and dielectric loss tangent as those of the dielectric layers used in the first panel 10 and the second panel 20 , and minimizes an influence on the reflection characteristics of the first panel 10 and the second panel 20 .
  • the bottom frame 58 may include a rail for sliding the first part 315 , or the holding part 31 C may be slidably formed on the frame 50 for holding a side edge of a reflection panel 30 C.
  • the holding part 31 is attached using the top frame 57 , the bottom frame 58 , or the frames 50 for holding the periphery of the reflection panel 30 .
  • the holding part 31 may be attached directly to an edge of the reflection panel 30 .
  • FIG. 9 shows a layer structure of the first panel 10 in the thickness direction (the Y direction).
  • the first panel 10 includes a conductive layer 11 and a dielectric layer 14 or 15 joined to at least one of the surfaces of the conductive layer 11 with an adhesive layer 12 or 13 interposed therebetween.
  • the conductive layer 11 is interposed between the dielectric layers 14 and 15 with the adhesive layers 12 and 13 respectively interposed therebetween.
  • the conductive layer 11 is a surface that forms a reflection surface of the first panel 10 and is formed of a metal material suitable for specular reflection.
  • a good conductor such as Cu, Ni, SUS, Ag, or Au can be used.
  • the conductive layer 11 has a thickness of 10 ⁇ m or thicker and 200 ⁇ m or thinner, preferably 50 ⁇ m or thicker and 150 ⁇ m or thinner, so as to sufficiently function as a reflection surface that specularly reflects an electromagnetic wave having a desired frequency.
  • the adhesive layers 12 and 13 have a transmittance of 60% or higher, preferably 70% or higher, and more preferably 80% or higher for the used frequency so as to guide the incident electromagnetic wave to the conductive layer 11 .
  • the adhesive layers 12 and 13 may be made of vinyl acetate resin, acrylic resin, cellulose resin, aniline resin, ethylene resin, silicon resin, or other resin materials.
  • An ethylene-vinyl acetate (EVA: ethylene-vinyl acetate) copolymer or a cycloolefin polymer (COP) may be used in order to make the adhesive layers 12 and 13 durable and moisture-resistant for outdoor use.
  • each of the adhesive layers 12 and 13 is such a thickness that the dielectric layers 14 and 15 can be reliably bonded to and held by the conductive layer 11 , and is, for example, 10 ⁇ m or thicker and 400 ⁇ m or thinner.
  • the adhesive layers 12 and 13 have a dielectric constant and a dielectric loss tangent suitable for achieving the target reflection characteristic of the conductive layer 11 .
  • Each of the dielectric layers 14 and 15 is an insulating polymer film made of a polymer material such as polycarbonate, cycloolefin polymer (COP), polyethylene terephthalate (PET), and fluorocarbon resin.
  • the thickness of each of the dielectric layers 14 and 15 is selected in a range of thicker than 1.0 mm and not thicker than 10.0 mm.
  • the ratio of the thickness of each of the dielectric layers 14 and 15 to the thickness of the conductive layer 11 is higher than 10 and not higher than 80.
  • the first panel 10 has a mechanical strength strong enough to withstand outdoor use, and hence the target reflection characteristic can be achieved.
  • the ratio of the thickness of the dielectric material to the conductive layer 11 may be increased within a range where the reflection characteristic is not hindered.
  • FIG. 10 shows a layer structure of the second panel 20 in the thickness direction (the Y direction).
  • the second panel 20 includes a dielectric layer 215 , a conductive layer 214 held by an adhesive layer 213 on one surface of the dielectric layer 215 , and a protective layer 212 that covers the conductive layer 214 .
  • the dielectric layer 215 is an insulating polymer film made of a polymer material such as polycarbonate, cycloolefin polymer (COP), polyethylene terephthalate (PET), and fluorocarbon resin, and has a thickness of about 0.3 mm to 1.0 mm.
  • the dielectric layer 215 may be formed of any material having a dielectric constant and a dielectric loss tangent suitable for achieving the target reflection characteristic.
  • a ground layer 216 is formed on a surface of the dielectric layer 215 opposite to the conductive layer 214 .
  • the conductive layer 214 forms a meta-surface of the second panel 20 , that is, a surface having an artificially controlled reflection characteristic.
  • the conductive layer 214 has a predetermined pattern which is formed of metal patches 211 formed of a good conductor such as Cu, Ni, Ag, or Au.
  • the conductive layer 214 has a thickness that enables an incident electromagnetic wave to be reflected in a designed direction with a sufficient intensity, for example, a thickness of 10 ⁇ m to 50 ⁇ m.
  • the adhesive layer 213 is formed of a material capable of supporting the metal patches 211 and fixing them to the dielectric layer 215 .
  • a thermoplastic resin such as a vinyl acetate resin, an acrylic resin, a cellulose resin, or a silicone resin
  • the adhesive layer 213 has a thickness of about 5 ⁇ m to 50 ⁇ m.
  • the protective layer 212 that covers the conductive layer 214 is desirably durable and moisture-resistant, and for example, an ethylene-vinyl acetate (EVA) copolymer or a cycloolefin polymer (COP) can be used.
  • EVA ethylene-vinyl acetate
  • COP cycloolefin polymer
  • the protective layer 212 has a thickness of 10 ⁇ m to 400 ⁇ m.
  • the protective layer 212 may be formed of an adhesive layer to fix a dielectric substrate made of polycarbonate or the like on a surface of the protective layer 212 .
  • the reflection characteristic of the reflection panel 30 is evaluated by combining the first panel 10 shown in FIG. 9 with the second panel 20 shown in FIG. 10 . It is presumed that the interval G between the first panel 10 and the second panel 20 , that is, the thickness of the air layer, affects the characteristic of the reflection panel 30 .
  • the reflection characteristic is evaluated by variously changing the interval G.
  • FIG. 11 shows a model of a conductive pattern used for the conductive layer 214 of the second panel 20 .
  • the model for evaluating the conductive layer 214 includes a periodic array of unit cells (also referred to as “supercells”) 210 .
  • the unit cells 210 are arranged in six rows in the X direction and 36 columns in the Z direction, and form a meta-surface that reflects an electromagnetic wave at an angle different from the incident angle thereof.
  • the X and the Z directions respectively correspond to the X and the Z directions in FIG. 1 .
  • FIG. 12 is a schematic diagram showing a structure of the unit cell 210 .
  • the unit cell 210 is formed of six metal patches 211 a, 211 b, 211 c , 211 d, 211 e , and 211 f (may be collectively referred to as “metal patches 211 ” as appropriate).
  • the metal patches 211 a to 211 f have the same width (W) and lengths (L) different from one another, but have the same central axis of the length (L).
  • the pitch between the metal patches in the X direction is fixed.
  • the phase of reflection is controlled by the shapes and the sizes of the metal patches 211 a to 211 f and the intervals in the X direction therebetween, and a reflection beam is formed in a desired direction by superimposing reflected waves.
  • the unit cell 210 is designed so that the peak of a reflected wave of an electromagnetic wave which is perpendicularly incident (an incident angle 0°) appears in a direction of 50° from the normal.
  • the second panel 20 shown in FIGS. 10 to 12 is held at a predetermined interval G from the first panel 10 shown in FIG. 9 .
  • a plane wave of 28.0 GHz is made incident at an incident angle of 0°, and the scattering cross section of the reflected wave is analyzed by using general-purpose three-dimensional electromagnetic field simulation software.
  • the scattering cross section namely, a Rader Cross Section (RCS), is used as an index of the ability to reflect an incident electromagnetic wave.
  • RCS Rader Cross Section
  • the meta-surface of the second panel 20 reflects an electromagnetic wave in a direction different from the incident angle thereof.
  • the power reflection efficiency of the meta-surface is a value obtained by dividing the power reflection efficiency obtained from a gain value by a correction value.
  • the power reflection efficiency is set to 65% or more, preferably 70% or more, and more preferably 75%. When the power reflection efficiency becomes lower than 65%, it becomes difficult to obtain a sufficient effect of improving a radio wave environment.
  • FIG. 13 shows an analysis space 101 for an electromagnetic wave simulation.
  • the analysis space 101 is expressed by (a size in the X direction) ⁇ (a size in the Z direction) ⁇ (a size in the Y direction) by defining the thickness direction of the layer structure shown in FIG. 10 as the Y direction, the width direction of the metal patch 211 of the model shown in FIG. 11 as the X direction, and the length direction of the same as the Z direction.
  • the size of the analysis space 101 when the frequency of the incident electromagnetic wave is 28.0 GHz is 83.9 mm ⁇ 192.6 mm ⁇ 3.7 mm.
  • the boundary condition is a design in which an electromagnetic wave absorber 102 is disposed on the periphery of the analysis space 101 .
  • a panel having the layer structure shown in FIG. 10 and the conductive pattern shown in FIG. 11 having a plane size of 0.7 m in length and 0.7 m in width is used as the second panel 20 .
  • a polycarbonate sheet having a length of 0.7 m, a width of 0.7 m, and a thickness of 0.7 mm is used as the dielectric layer 215 .
  • the ground layer 216 formed of an Ag-based multilayer film having a thickness of 0.36 mm is provided on one side of the polycarbonate sheet, and the conductive layer 214 including the metal patch 211 formed of copper foil having a thickness of 0.03 mm is provided on the other side of the polycarbonate sheet with the adhesive layer 213 having a thickness of 0.01 mm interposed therebetween.
  • the protective layer 212 of EVA having a thickness of 400 ⁇ m is provided so as to cover the conductive layer 214 .
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.5297 dB.
  • the interval G is 0.0 mm, a high power reflection efficiency exceeding 75% can be obtained.
  • Example 2 is Implementation Example 2.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.4541 dB.
  • a power reflection efficiency after this gain value is corrected by the correction value ⁇ p 0.7826 is 78.5%.
  • the interval G is 1.0 mm, a high power reflection efficiency exceeding 75% can be obtained.
  • Example 3 is Implementation Example 3.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.7936 dB.
  • a power reflection efficiency after this gain value is corrected by the correction value ⁇ p 0.7826 is 72.6%.
  • the interval G is 5.0 mm, a high power reflection efficiency exceeding 70% can be obtained.
  • Example 4 is Implementation Example 4.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.7661 dB.
  • a power reflection efficiency after this gain value is corrected by the correction value ⁇ p 0.7826 is 73.1%.
  • the interval G is 10.0 mm, a high power reflection efficiency exceeding 70% can be obtained.
  • Example 5 is Implementation Example 5.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.4887 dB.
  • the interval G is 20.0 mm, a high power reflection efficiency exceeding 75% can be obtained.
  • Example 6 is Implementation Example 6.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.8146 dB.
  • a power reflection efficiency after this gain value is corrected by the correction value ⁇ p 0.7826 is 72.3%.
  • the interval G is 50.0 mm, a high power reflection efficiency exceeding 70% can be obtained.
  • Example 7 is Implementation Example 7.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 1.7730 dB.
  • a power reflection efficiency after this gain value is corrected by the correction value ⁇ p 0.7826 is 73.0%.
  • the interval G is 90.0 mm, a high power reflection efficiency exceeding 70% can be obtained.
  • Example 8 is Comparative Example 7.
  • the configurations and the shapes of the first and the second panels 10 and 20 are the same as those of the first and the second panels 10 and 20 in Example 1.
  • a gain value (a peak value of a reflected waveform) at 50° in the RCS plot when an electromagnetic wave incident at an incident angle of 0° is reflected at a reflection angle of 50° is ⁇ 2.2818 dB.
  • the interval G is 100.0 mm, a power reflection efficiency is less than 65%, and thus it is difficult to expect a sufficient improvement of the radio wave environment.
  • the interval G between the first panel 10 and the second panel 20 be an interval of 0.0 mm or longer and less than 100.0 mm in a direction perpendicular to the panel surface of the reflection panel 30 .
  • an incident electromagnetic wave can be reflected in a designed direction with a sufficient reflection intensity.
  • the position of the second panel 20 can be adjusted to an optimal position in accordance with an arrival direction of an electromagnetic wave and a direction in which the electromagnetic wave is to be reflected. It is also possible to hold two or more second panels 20 for one first panel 10 while keeping the above-described range of the interval G.
  • the area of irregular reflection can be expanded. Since the first panel 10 of specular reflection having a large area can be easily fabricated, a plurality of second panels 20 can be movably held relative to the first panel 10 having a size of, for example, 3.0 m ⁇ 3.0 m. By using the first panel 10 , an area in which a radio wave propagation environment can be improved by a panel having a large area where the power reflection efficiency thereof is close to 100% can be expanded. By using the second panel 20 , a radio wave propagation environment of an area that cannot be covered by specular reflection can be improved.
  • a transparent wire of a winding type instead of a slider mechanism, may be used as the second part 312 of the holding part 31 , and may be combined with a transparent hook that serves as the first part. If the strength and the safety of the reflection panel 30 are sufficiently ensured, only one of the top frame 57 , the bottom frame 58 , or the frames 50 which are side frames may be used.
  • the frame 50 When a plurality of electromagnetic-wave reflecting apparatuses 60 are connected to one another, it is desirable that at least a part of the frame 50 , specifically, a part connecting the edges of two adjacent first panels 10 to each other, be formed of a conductor in order to make the reflection potential between the adjacent first panels 10 of the reflection panels 30 continuous.
  • the second panel 20 When one electromagnetic-wave reflecting apparatus 60 is used alone, the second panel 20 may be movably held relative to the first panel 10 by using the side frames 50 .
  • the above disclosure may include the following embodiments.
  • a reflection panel comprising:
  • the reflection panel according to Item 1 wherein the second panel is disposed on a side of the first panel on which the electromagnetic wave is incident.
  • the reflection panel according to Item 1 or 2 wherein a plane size of the second panel is smaller than a plane size of the first panel.
  • the reflection panel according to any one of Items 1 to 3, wherein the second panel is held so as to be movable relative to the first panel or detachable from the first panel.
  • the reflection panel according to any one of Items 1 to 4, comprising a holding part configured to hold the second panel, the holding part being attached to a part of an edge of the first panel so as to be movable or detachable.
  • An electromagnetic-wave reflecting apparatus comprising:
  • the electromagnetic-wave reflecting apparatus according to any one of Items 7 to 9, wherein the second panel is held so as to be movable relative to the first panel or detachable from the first panel.
  • the electromagnetic-wave reflecting apparatus comprising a holding part configured to hold the second panel relative to the first panel,

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)
US19/238,110 2022-12-21 2025-06-13 Reflection panel and electromagnetic-wave reflecting apparatus Pending US20250309555A1 (en)

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JP2022204383 2022-12-21
JP2022-204383 2022-12-21
PCT/JP2023/044426 WO2024135455A1 (ja) 2022-12-21 2023-12-12 反射パネル、及び電磁波反射装置

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JP2015046846A (ja) * 2013-08-29 2015-03-12 日本電信電話株式会社 アンテナ装置設計方法及びアンテナ装置
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JP7566643B2 (ja) * 2021-01-12 2024-10-15 電気興業株式会社 リフレクトアレー、リフレクトアレーの設計方法、および、リフレクトアレーシステム

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